[libunwind] [flang] [mlir] [llvm] [libcxx] [clang-tools-extra] [lldb] [clang] [libunwind] fix dynamic .eh_frame registration (PR #77185)

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https://github.com/lhames approved this pull request.

Ok -- local testing seems to confirm that this is the right fix. We need to add a testcase for this API, but that can happen as a follow-up.

https://github.com/llvm/llvm-project/pull/77185